Self-induction coil for duplex or multiplex telephone connections.



AXEL HERMAN OLSSON AND HENNING BERNHARD MATHIAS PLEIJEL,

SWEDEN.

SELF-INDUCTION con. r03

Application filed November 2, 1914. Serial No. 869,955.

To all whom it may concern:

. new and useful Improvements in Be it known that we, Axnn HERMAN OLs- SON, engineer, and Hnxmxc Bnnxnxm) MATHIAS PLEIJEL, professor, both subjects of'the King of Sweden, citizens of Sweden, and residing, respectively, at Bergsgatan 163 and Brunnsgatan '2 Stockholm, in the Kingdom of Sweden, have invented certain Self-Induction Coils for Duplex or Multiplex Telephone Connections, of which the following is a specification,

According to another application, the inventors have proposed to obtain the Pupineffect in duplex or multiplex telephone connections by the aid of the leakage fields, which, on account of the currents in the duplex lines, arise between the iron cores 0 two or more superposed double coils, each of the known type. In most cases the selfinduction load, which will in this way be effected in the duplex line, especially as, for each group of coils in the double line, two groups of coils loading the duplex line will be obtained. In some cases, however, it is of importance to augment the self induction load in the duplex line without changing the load given to the double lines. This is obtained, according to this invention, by reducing the ance', which is to be passed by the leakage field. This can, of course, be performed in difiorent ways. According to one embodiment of the invention, those. points of the iron cores of the coils, where the two halves of the winding meet each other, are free from windings to such a degree as is necessary for obtaining the desired strengthening of the leakage fiel Between the iron cores, at the ab ve-n'amel points, a yoke or block of laminated iron is arranged.

An embodiment of the invention is shown on the-annexed drawing.

Figure 1 shows a coil combination consisting of two superposed rings. Fig. 2 is a section on.line A-B in Fig. 1. From the figures-it is seen how ings are omitted at the points C, D and C D. F and G are the iron blocks or yokes, inserted between the iron cores at sa-i points. The air-gaps can be made greater or smaller as desired.- The yokes or blocks F. G. consist of laminated iron, the number the windn STATES PATENT OFFICE.

DUPLEX on MULTIPLEX rnnnrnonn commc'rmns.

Specification of Letters Patent.

will be sufiicient,

magnetic resist- I of said, coils.

OF STOCKHOLM,

Patented Aug. 3, 1915.

whereof is made dependent upon the degree the leakage fields deby making double lines will be obtained, as the magnetic fields set up by the currents in the double lines will be poleless and will be completely inclosed in the iron cores.

What we claim is:

1. In self-induction coils for duplex or multiplex telephone connections containing groups of induction coils, each group containing more than one coil, means for reducing the magnetic resistance between the coils of each group, whereby the leakage field will be augmented.

2. In self-induction coils for duplex or multiplex telephone connections "containing groups of induction coils, each group containing more than one coil, means for reducing the magnetic resistance between the coils of each group, said means consisting in iron blocks inserted between the iron cores '3. In self-nduction coils for duplex or groups'of induction coils, each group containing more" than the one coil, each provided with two windings, means for reducing the magnetic resistance between the coils of each group, said means consisting-in iron blocks inserted between the iron cores 0 said coils at the points, where the two wmding halves of the coils meet each other.

In testimony whereof we have afiixed signatures in presence of two witnesses.

,AXEL HERMAN OLSSON. HENNING BERNIIARD MATIIIAS PLEIJEL.

Vitnesses:

Gnn'ra Puma, j HARRY Arman. 

